Originally Posted by 96 Wideglide
Usually the small holes in the nozzle plugged.
I haven't had the pleasure 'yet'!
Yep, the holes in the nozzle are likely plugged. Just empty black tank first, dose it with liberal amount of Simple Green and some water, take the nozzle out and clean it, and recaulk it in place. Not a bad job.
Your first challenge might be to find where in the black tank it is located.